Electric meter.



J?- 0. MORGANTHALER.

ELECTRIC METER.

APPLICATION FILED MAY 22, 1909.

941,459. Patented Nov. 30, 1909.

Fig. 2.

/a @m m f ,4 -/0 /3' I A; 5 LJ L 1' Fig.3.

- Witnesses: I

I Inventorf revol uble 'e'rrnn STATS AENT caries.

PETER C. MORGANTHALER, 0F FORT WAYNE, INDIANA, ASSIGNOR TO FORT WAYNE ELECTRIC WORKS, A. GORPORATION- OF NEW YORK.

ELECTRIC METER.

:MEASQ.

To all whom it may concern: 1 I

Be it known that I, PETER (I. Monoax- THALER, a citizen of the United States, residing at Fort Wayne, county of Allen. State of Indiana, have invented certain new and useful Improvements in Electric Meters, of which the following is a-specificatiou.

My invention relates to wattmeters of the induction type, and has vfor its object the improvement in the construction of such meters.

The noveltiesof my invention are pointedout with more particularity in theclaims annexed to and forming a part of this speci- I fication.

For a further vention reference I ings, in whieh- Figure 1. shows diagrammatically a vertiunderstanding of my inmay be had to the drawcal view of a meter: Fig. 2 shows the shape and arrangement of the magnetic circuits; and Fig. 3 shows the connections which I employ with my meter.

Referring first to Fig. 1, I have shown a aru'iature 1 of the usual type arranged in any suitable manner to drive the gear train 2 for the registration of the on I ergy consumed in the circuit to which the l meter is connected. In operative relation the armature a U-shaped core 3. Referring to Fig. 2, this core is shown, as made I up of two end-members 7 connected by a member 8. This core is made of such a shape that it has double poles 4, 5, the inner poles being separated by the air-gap 6, so that the greater portion of the flu. produced in the core will pass across this gap fox-the purpose well ui'u'lerstood by those skilled in the art. In operative relation with the armature and the U-shaped core 3, and placed! on the opposite side of the armature -from thecore 3, is a C-shapcd member 9 having] its ends it) substantially opposite .the outer I poles 5 of the core 3. Energizing U-shaped core 3 is a potential coil 11. which is carried by the core. Surroumliug the. inner poles 4 is a series coillQ, and surrounding each of poles 5 are lagging coils 13.

Referring now to Fig. 3, the potential coil 11 is shown as connected in the usual manner across the conductors of the circuit whose energy it is desired to measure, and

"coil 12 is shown as connected in series with one conductor of thecircuit; but it is obvious I Specification of Letters Patent. Application filed May 22, 1909. Serial No. 497,663.

Patented Nov. so, race.

that coil .12 may be connected across a shuntin themam circuit for the purpose of I reducing the current flowing through the coil in the manner well understood those skilled in the art, or that the usual series and potential transformers may be used for energizing-the current and potential coils. Coils 13 are shown as connected in series, and connections are shown so that these coils may be connected acrdss portions of the potential winding 11., or they may be connected in a closed circuit upon themselves.

A resistance 14 is adapted to be in series with the coils when they areshort-cirmiited upon themselves for duciug the proper lag in the circuit in the manner well understood by'thosc skilled in the art, and a resistance 15 is shown adapted to be in series with the coils when they are energized from the portion of the potential winding. The connections of the coils may be altered by means ot' any suitable device, such as a switch 16. which is adapted to connect coils 13 across the to short-circuit them upon themselves. The object of these connections is to produce a proper amount of lag when the meter is operated upon circuits oi varying frequency. If a low frequency; be used, the held of the shunt coil will lag almost but not quite ninety degrees behind the field of the current coils for unity power factor. and in order to produce the proper ninety-degree lag. coils 13 are short'circuitcd upon thcnr selves through the resistance 14, which will boot such a value as to produce the proper phase relation. At a higher frequency. the potential field will lag more than ninety degrees behind the field ot' the series coil. and proper com :ensation is made by energizing the lagging coils from a portion of forms and connections which will be within the spirit of my invention, and ,.Will.be obgious to those. skilled in the art.-

W hat I claim as new, and desire to secure by Letters Patent of theUnited States, is:- 1. In an altei'nating-c=.-crent meter, a U

potential winding or the purpose of prooluble armature, a U-shaped core in operative relation therewith having double poles with an air-gap between the inner poles, a potential coil energizing the core, a series coil surrounding the inner poles, coils con"- nected in series surrounding the outer poles, means for altering the lagging efiect produced by the coils with i arying frequencies, and a C-shaped member having its ends in operative relation with the armature and the outer poles of the U-shaped core.

4:. inen alternatingmu'rent K116tQ1,2l row oluhle armature, a U-shaped core in operative relation therewith having double poles with an air-gap between the inner oles :1; potential coil energizing the core u series coil surrounding the inner poles, it resistance, coils connected in series surrcmnding); the outer poles, connections for county-ting the coils across a portion of the. potential coil or in series with the resistance, and. it C-shaped member in operative relation with the armature and the outer poles of the U- shaped core.

In witness whereof, have hereunto set myhand this 14th day of May, 1909 PLTER C. MOB-G ANTH ALER.

Witnesses E. A. \VAGNER, JAMES J. VVooo. 

